(4/5+2/3-1/15)x45
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(4/5+2/3-1/15)x45(4/5+2/3-1/15)x45(4/5+2/3-1/15)x45(4/5+2/3-1/15)x45=4/5x45+2/3x45-1/15x45=36+30-3=6
(4/5+2/3-1/15)x45
(4/5+2/3-1/15)x45
(4/5+2/3-1/15)x45
(4/5+2/3-1/15)x45
=4/5x45+2/3x45-1/15x45
=36+30-3
=63
如果本题有什么不明白可以追问,
(4/5+2/3-1/15)x45
=4/5x45+2/3x45-1/15x45
=36+30-3
=63
(4/5+2/3-1/15)x45
谁能告诉我这几道题的简便算法4X7/2+4X9/2+7/5X4 (3/1-5/1)X45
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(8分之1+4分之3)x(1—3分之1)= (3分之1—9分之1+15分之4)X45= 3.5X5分之4+6.5x80= 2.5X12.5 X32(8分之1+4分之3)x(1—3分之1)= (3分之1—9分之1+15分之4)X45= 3.5X5分之4+6.5x80= 5X12.5 X32=
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